Boot or shoe nailing machine



(N5 Model.)

H. S. BACON.

BOOT| OR SHOE MAILING MAOHINB.-

Ptelanted Apr 27, 1886 TK IX.'

I JE t ,j gm WM Wit E55 E5- n@ .a/fia@ UNITED STATES PATENT OFFICE.

HENRY S. BACON, OF MILFORD, MASSACHUSETTS.`

BOOT OR SHOE NAILING MACHINE.

SPECIFICAI'ION forming part Of Letters Patent NO. 340,540, lated April27, 1886.

Application filed August 29, 1885. Serial No. 175,609. (No model.)

To @ZZ whom it may concern.:

Be it known that I, HENRY S. BACON, of Milford, county of Worcester,State of Massachusetts, have invented a certain new and usefulImprovement in Boot or Shoe Nailing Machines, of whichthe following is afull, clear, concise, and exact description, taken in connection withthe drawings accompanying and forming a part hereof, in which- Figure lis a side elevation of a nailingmachine. Fig. 2 is a vert-ical centralsection of my improved gripping device. Fig. 3 is a section on line .frm, Fig. 2. Fig. 4 is a section on line y y, Fig. 2, Fig. 5 is a plan,and Fig. 6 is a section, of the operating-cam.

It is desirable in boot or shoe nailing ma chines in which the stock issupported by a horn that the horn should drop a given distance from thelower surface of the stock during the feed movement, and that thisdistance be constant whether the stock be thick or thin, and that themachine automatically adjust itself to obtain this result in passingfrom stock of one thickness to stock of a dii'ierent thickness.

The object of my invention is the construction of a simple mechanism toobtain these results, which may be applied to any nailingmachineemploying a horn, and it consists in the following described mechanism.

The accompanying drawings show my invention as applied to one form ofnailingmachine familiar to those skilled in the art. I shall conne mydescription, however, to those parts of said mechanism illustrated inthe accompanying drawings which are essential to an understanding of mypresent invention.

A is the main shaft of the machine, to which a cam-wheel, B, is secured,having a cam-path, a, cut in his face. This cam is connected with thehorn-post C, through the treadlelever D and connecting-rod E, and itwill be clear that if the connecting-rod E were actuated directly by thecam B the horn would be lowered by the throw of the cam at eachrevolution of the cam-wheel.

The mechanism which I have'constructed to eii'ect the objects above setforth is interposed between the upper end of the connecting-rod E andthe short rod F, which is connected directly with the cam-wheel B. Thismechanism is shown clearly in Figs. 2, 37 and 4 of the drawings, andconsists of a block, G, secured to the standard of the machine, andprovided with a vertical groove in its face adapted to receive the blockH, which slides therein. The block I is secured to the block H by screwsd, and has a vertical rectangular slot passing through it, as shown,Fig. 4, which receives the rod F, the linksf, and link-block l1., andthe upper end of connecting-rod E, as shown, Fig. 2. To the blocks I theguidepieces K K are secured by screws k. (See Fig. 3.) The rod F passesthrough slots in these guides, and is thereby held in position andprevented from lateral movement. The links f are pivoted at one end inslots in the rod F, as shown, Figs. 2 and 3, and at the other in slotsin the link-block h. (See Fig.2.)

If the rod F is moved upward by the action of the cam, the links f arebrought toward a horizontal position, forcing the link-block away fromthe rod F and against rod E, firmly grippingthe same, and the furtherupward necting-rod E and all the parts of the device secured to andwhich slide with block H.

To insure against the upward movement of blocks H and I with rod Fbefore the linkblock h has gripped rod E, I provide the spiral spring j,secured at one end to block G and at the other end to block I. Thisspring presents snfiicient resistance to the upward movement to overcomeany sticking of rod F to block I. A pin, a, is set in this stationaryblock G, and projects into the slot m, cut in the lower end of block H.When the linkblock has released rod E, the sliding-block H will dropdownward until pin u strikes the upper end of slot m, when it isprevented from further downward movement, and is held ready for the nextrevolution of the cam.

If stock of varying thicknesses -is put on the horn, it will affect theheight at which connecting-rod E will stand in the gripping device; butthe action of the cam B will cause the gripper to seize the rod atwhatever height the rod is, and, after it has seized it, the throw ofthe cam being constant, the downward movement of thchorn from the pointat which it stands when the gripper seizes rod E will also be constant,and as this point depends upon the thickness of the stock directly abovemovement of rod F carries upward the conthe horn at the time, the deviceacts automatthereto and to the short rod, and the sliding ically. blockI, all arranged substantially as and for What claim is,M the purpose setforth. In a boot and shoe nailing machine, the HENRY S. BACON. 5combination, with the horn-post, its lever, and itnesses:

connectingmod, of the short rod F and the WVM. A. MACLEOD,actuating-cam, the block h and links f, pivoted l ROBERT XVALLACE.

